Sheet-metal article



Oct. 18, 1927.

E. F. TOBOLD SHEET METAL ARTICLE Filed July 11. 1922 Patented Oct. 18, 1927.

UNITED STATES PATENT OFFICE.

EWAID F. TOBOLD, OF CLEVELAND, OHIO, ASSIGNOR TO THE DILL MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

SHEET-METAL ARTICLE.

Application filed July 11,

The present invention relates to a drawn sheet metal article and the method of making the same.

More particularly the article shown is intended for use as a dust cap in connection with pneumatic tire valves, but it will be obvious as the description of the inventlon proceeds that the utility of the invention is not limited in this particular.

The object of the invention is to provide a drawn sheet metal shell which may be slotted at the outer end thereof, but closed against the entrance of dirt, moisture, etc., through that end of the shell which is slotted.

Reference should be had to the accompanying drawings forming a part of this specification, in which Fig. 1 represents a finished shell, Fig. 2 is an elevation with portions in section of a shell partly formed; Fig. 3 is an elevation with portions in sec tion of a shell partly formed; Fig. 4 is an elevation with portions in section of a shell formed but unslotted. Fig. 5 is an elevation with portions in section of a complete shell slotted. Fig. 6 is a top plan view of the shell shown in Figs. 1 and 5.

The shell, which is indicated at 1, is preferably formed from a blank of sheet metal and made into a tubular piece, which at one end has a tubular extension 2 which is of less diameter than the diameter of the main portion of the shell 1. Furthermore, the diameter of this portion 2 may be of larger diameter than it will be in its finished condition.

hen the shell has been drawn up to the form shown in Fig. 2, the outer end of the tubular portion 2 is pushed in upon itself, thereby forming a reentrant tubular portion 3.

In some instances where it is desired to have the tubular extension of less diameter than that which it assumes up to the present point in the method of manufacture as despribed, the tubular extension 2 may be rolled or spun out so as to lengthen it somewhat and reduce its diameter. This will of course also reduce the diameter of the reentrant tubular member 3, and will bring the engaging walls of the tubular extension 2 and the reentrant tubular member 3 into close contact. For many purposes an article having the construction and form which is illus- 1922. Serial No. 574,330.

trated in Fig. 4 of the drawing will be useful, but in the present instance in order to adapt the formed shell for use as a dust cap, the

2. It is to be noted, however, that this slot is not deep enough to pierce the end of the reentrant tubular member 3, and therefore no dust or dirt or water can enter the end of the shell which has the screw driver provisions, so that when a device of this kind is used as a dust cap the end of the valve stem with the valve insides in it are fully protected against mud, dirt, etc.

Moreover, by the particular construction which has been described, the walls of the tubular extension adjacent the slot 4 are strengthened because of the double thickness of metal on each side of the slot, which has a material effect in producing better wear and minimizing the danger of bending or turning the metal when the shell is used in the operation of inserting or removing a valve insides in a valve stem.

Having described my invention, I claim 1. As an article of manufacture, a tubular shell having at one end a tubular extension and a reentrant tubular member within said tubular. extension which reentrant tubular member is closed at its end, the walls of said tubular extension and tubular reentrant member being in contact and having a transverse slot formed therein.

2. As an article of manufacture, a tubular shell having at one end a tubular extension and a reentrant tubular member within said tubular extension, which is formed integral with the tubular extension, the walls of said tubular extension and reentrant tubular member being in contact and having a transversely extending slot.

In testimony whereof, I hereunto afiix my signature.

EWVALD F. TOBOLD. 

